Columnar grain width control for SS316L via hatch spacing manipulation in laser powder bed fusion

Columnar grain width control for SS316L via hatch spacing manipulation in laser powder bed fusion

This study provides a quantitative way to tailor the grain structure in laser powder bed fusion (LPBF). Square-bottomed columnar grains (SCGs) were developed with a certain width roughly equal to the hatch spacing. The development of SCGs relied on different distinguishable regions, which were ident...

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Bibliographic Details
Main Authors: Hu, Zhiheng, Gao, Shubo, Tai, Junfei, Qu, Shuo, Ding, Junhao, Song, Xu, Fan, Zheng
Other Authors: School of Mechanical and Aerospace Engineering
Format: Article
Language:English
Published: 2023
Subjects:
Engineering::Mechanical engineering
Laser Powder Bed Fusion
Hatch Spacing
Online Access:https://hdl.handle.net/10356/165024
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Institution: Nanyang Technological University
Language: English
Description
Summary:This study provides a quantitative way to tailor the grain structure in laser powder bed fusion (LPBF). Square-bottomed columnar grains (SCGs) were developed with a certain width roughly equal to the hatch spacing. The development of SCGs relied on different distinguishable regions, which were identified based on the differences in microstructural features between the melt-pool side and centreline. High lattice rotation accumulated at the melt-pool centreline, leading to grain boundaries forming at the centreline regions. The ultrasonic attenuation measurements and microhardness tests further validated the controllable properties. The findings indicated a novel approach to customise the material property.

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